But would this mean that the girl finding deep throat to arouse her, would be more aroused by two cocks? This is a serious question, by the way. I'm just talking about her arousal from the stimulus of the gagging.
I doubt many women get arousal from the stimulus of gagging alone. It's the mental aspect; gagging is a statement. I'll do whatever it takes to please you, even though it's mostly unpleasant. In return, he states, I know I deserve this and you are such a good girl. The rougher things get, the stronger the statement, and the arousal.
It doesn't work otherwise.
I met a guy. I liked him. I'm giving him a blowjob, deepthroating; I'm having the time of my life and a pool party in my pants. He says he loves it, and then he asks if what I'm doing is not unpleasant for me. I tell him not to worry, but no, he wants to make sure. I tell him to shut up and just enjoy the ride, but no, he can't, he's worried if I can breathe right. Mind you, I'm on top; not as if I can't pull away if I need to. We go back and forth like that for a minute and... I guess you could say he blew it. I appreciate his concern, but the arousal's completely gone (mine, that is).
It's not so much the number of cocks, it's the minds they are attached to.